The widely-known Boscastle Harbour blowhole, from pretty close. Deep subterranean boomy thuds, many of them immediately followed by a powerful usually low-angle jet of spray. Usually the jet itself is quiet, so what we hear of it is the long splashdown each time. After about 26 minutes the activity continues at a lower level; this is the first 32' of the 48-minute recording.
There's an early version of this recording here, but this is better adjusted, and with stereo enhancement that the early recording didn't have.
I made this recording on 9 January 2013 beside Boscastle Harbour, Cornwall, UK. This was part of a dedicated day's recording around there — i.e., rather than during a hike. The swell was reasonably chunky, and the local wind relatively light, and indeed falling calm for the final recording (the next upload here). It was an excellent day for recording there too because it was midweek in winter, so there were little or no people or barking dog disturbances.
Advisory
Because of the processing to widen and sharpen the originally atrocious stereo imaging, the sea may sound rather phasey when listened to from certain speaker systems. Therefore high-grade headphones are the best solution.
Also, I recommend a volume setting 3dB higher than a sensible normal level.
This recording in progress. I got as close as I dared on this convex broken-up cliff slope, still with some risk to life and limb! — And yes, I've noticed from this photo that the recorder was pointing in a slightly wrong direction. How careless of me!
Techie stuff
The recorder was Sony PCM-M10, with Røde DeadKitten furry windshield (original, more effective, version). It was set up on a Hama Mini tripod, which is not just 'mini' but tiny.
Post-recording processing was to apply EQ in Audacity to correct for the muffling effect of the windshield — and then more recently stereo widening / sharpening-up using the VST plugin A1 Stereo Control (160% widening).
Please remember to give this recording a rating — Thank you! 
This recording can be used free of charge, provided that it's not part of a materially profit-making project, and it is properly and clearly attributed. The attribution must give my name (Philip Goddard) and link to https://freesound.org/people/Philip_Goddard/sounds/703575/
Type
Flac (.flac)
Duration
31:59.230
File size
142.1 MB
Sample rate
44100.0 Hz
Bit depth
16 bit
Channels
Stereo
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